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Summary of Significant Accounting Policies - Basis of Presentation (Details)	Dec. 31, 2025 subsidiary
First Bank
Subsidiary or Equity Method Investee [Line Items]
Number of wholly owned subsidiaries	2

X

- Definition

Number Of Subsidiaries

+ References

No definition available.

+ Details

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Namespace Prefix:	fbnc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_SubsidiaryOrEquityMethodInvesteeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=fbnc_FirstBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: